/*
 *	Copyright 2011 andro-inject developers 
 *	Licensed under the Apache License, Version 2.0 (the "License"); 
 *	you may not use this file except in compliance with the License. 
 *	You may obtain a copy of the License at
 *
 * 	http://www.apache.org/licenses/LICENSE-2.0
 * 
 *	Unless required by applicable law or agreed to in writing, software 
 *	distributed under the License is distributed on an "AS IS" BASIS,
 *	WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *	See the License for the specific language governing permissions and
 *	limitations under the License. 
 * 
*/

package com.androinject.android;

import android.content.Context;

import com.androinject.core.ComponentFactory;
import com.androinject.core.ComponentFactoryProvider;

public class AndroidInitializationHelper {
	
	public static void initializeManagedComponent(Context managedComponent, String componentId) {
		ComponentFactory factory = getComponentFactory(managedComponent);
		if (componentId == null) {
			factory.initializeManagedComponent(managedComponent);	
		} else {
			factory.initializeManagedComponent(managedComponent, componentId);
		}
	}
	
	
	private static ComponentFactory getComponentFactory(Context managedComponent) {
		Context applicationContext = managedComponent.getApplicationContext();
		if (applicationContext instanceof ComponentFactoryProvider) {
			ComponentFactory  componentFactory = ((ComponentFactoryProvider) applicationContext).getComponentFactory();
			if (componentFactory != null) {
				return componentFactory;
			}
			throw new NullPointerException("Cannot initialize managed component. Application does not return a valid ComponentFactory.");
		}
		throw new IllegalStateException("Cannot initialize managed component. Application does not implement ComponentFactoryProvider interface!");
	}

}
